Display screen or portion thereof with a graphical user interface for a machine-readable label



The FIGURE is a front view of a display screen or portion thereof with agraphical user interface for a machine-readable label showing thedesign.

The dashed-dotted broken lines illustrate a display screen or portionthereof and form no part of the claimed design. The dashed broken linesillustrate portions of the graphical user interface for amachine-readable label that form no part of the claimed design. Thestippled shading forms no part of the claimed design.

CLAIM The ornamental design for a display screen or portion thereof witha graphical user interface for a machine-readable label, as shown anddescribed.